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DS92LX1621/22 GPIO BIT RATE

Seishin
Genius 4135 points
Other Parts Discussed in Thread: DS92LX1622, DS92LX1621

Hi,

Now we are designing our next product with using DS92LX1621 and DS92LX1622.

We would like to use bidirectional control channel for GPIO communication.

There is no statement of the following parameters in the data sheet.

GPIO BIT RATE:
Forward Channel Bit Rate
Back Channel Bit Rate
GPIO Pulse Width,Forward Channel
GPIO Pulse Width,Back Channel

Please let me know if there are any information.

Best regards,
Seishin

  • 0
    TI__Mastermind 29655 points

    Hi Seishin,

    Information about the GPIO communication can be found on p. 30-31 of the DS92LX1621/DS92LX1622 datasheet.

    Forward Channel (Ser =>Des) Bit Rate/Pulse Width are dependent on the PCLK rate. GPIO signals will be sampled according to the PCLK.

    Back Channel (Des => Ser) Bit Rate/Pulse Width are dependent on an internal oscillator, with a maximum speed of 66 kHz.

    Note that the maximum data latency for GPIO data transmitted across multiple links is 25 us.

    For more information about transmission over back channel communication, please refer to the following app note:

    http://www.ti.com/lit/an/snla222/snla222.pdf

    Though this relates primarily to I2C communication, the information in this app note has commonalities with the way in which GPIO communication to remote devices works in bidirectional communication (for example, an explanation of BCC delay is more clearly described in this document).

    Thanks,

    Michael